(a) Proceeds of the bonds issued under authority of this article shall be used solely for the payment of the cost of projects and shall be disbursed upon requisition or order of such person and under such restrictions as the resolution authorizing the issuance of such bonds or the trust agreement or indenture may provide.

(b) If the proceeds of such bonds, including all series or installments of such issue, by error of calculation or otherwise, are less than the cost of projects, then, unless otherwise provided in the resolution authorizing the issuance of the bonds or in the trust agreement or indenture, additional bonds may in like manner be issued, subject to the requirements of subsection (a) of Code Section 46-3-131 to provide the amount of such deficit. Unless otherwise provided in the resolution authorizing the issuance of the bonds or in the trust agreement or indenture, such additional bonds shall be deemed to be of the same issue and shall be entitled to payment from the same fund, without preference or priority, as the bonds first issued for the same purpose.

(c) If the proceeds of the bonds of any issue exceed the amount required for the purpose for which such bonds are issued, the surplus shall be paid into the fund provided for the payment of principal and interest of such bonds.

(d) In the discretion of the authority, revenue bonds of a single issue or series or installment of such issue may be issued for the purpose of paying the cost of any one or more projects.